Question
Find the direction cosines of Y-axis.
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$\sin^{-1} \bigg( \sin \frac{3{\pi}}{5}\bigg)$
$\text{A}=\begin{bmatrix}\text{a}+4&3\text{b}\\8&-6\end{bmatrix},\text{ B}=\begin{bmatrix}2\text{a}+2&\text{b}^2+2\\8&\text{b}^2-5\text{b}\end{bmatrix}$